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Polyethylene film is a thermoplastic material made by polymerizing ethylene gas. It is commonly produced using blown film extrusion and used in flexible packaging, agriculture, tamper-evident packaging, and construction. Its ability to self-seal under heat makes it ideal for various applications.
Polyethylene film is a resinous material with thermoplastic properties which is synthesized by inducing the oxidative polymerization of ethylene gas. The degree of pressure used in its manufacture varies according to the density and melting point of the virgin polymer resin used. Most commonly, sheets of polyethylene film are produced using a process known as blown film extrusion, in which the polymer resin is melted at its flow point and then extruded through a mold to produce a plastic tube. While the polyethylene is still elastic, the tube is capped at one end and then blown to inflate and stretch the film to the desired length and thickness. The thickness of the polyethylene film can be up to 0.004 inch (10.16 micron).
The introduction of this film was considered innovative in terms of application in the packaging industry. In particular, it has proven to be very valuable in the flexible packaging market. In fact, it has captured most of the plastic packaging segment, which mainly consists of bags and packaging material used for storage or to protect from the environment. This includes plastic wrap to protect agricultural crops, as well as regular kitchen wrap used to store food. Of course, polyethylene film is also essential in the production of bags, from dry cleaning protective covers to trash and grocery bags.
One reason why polyethylene film dominates all other materials previously used in packaging is its ability to self-seal under controlled heat. Shrink wrap, for example, protects items by literally shrinking around them to form a seal in response to the application of heat. This ability makes this film ideal for use in making tamper evident packaging and for sealing electrical cables. Additionally, polyethylene sheets can be sewn or stapled together, or even glued.
Polyethylene film is also widely used in the agricultural industry where it has many applications. For one thing, it is used to protect crops and seeds from pests and diseases. This material also helps prevent moisture and heat from escaping.
While most people are familiar with polyethylene film due to its presence in many consumer products, it has some lesser-known applications. In fact, it is frequently used in building and construction. In addition to acting as a tarp to protect equipment and building materials, it is also placed within the structural interior of buildings to prevent moisture invasion. The polyethylene film also acts as a blanket to help harden the concrete slabs.
